Brake-shoe.



F. W. GRANT.

' BRAKE SHOE.

APPLICATION FILED JUNE 11. m4.

1,134,609. Patented Apr. 6, 1915.

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I k a I mventoz ii mk WMW THE NORRIS PETERS 60.. PHDTO-LITHQ, W ASHINGmN. D4 4 FREDERICK W. GRANT, or :ainenwoon, NEW JERSEY. 5

BRAKE-SHOE.

Specification of Letters Patent.

Patented Apr. 6, 191.5."

Application filed. June 17, 1914. Serial No. 845,559.

To all whom it may concern: 7

Be it known that I, FREDERICK W. -GRANT, a citizen of the United States, residing at Ridgewood, county of Bergen, State of New Jersey, have made a certain new and useful Invention in Brake-Shoes, of which the following is a specification.

This invention relates to brake shoes.

It is among the special purposes of my invention to provide a shoe structure in which the shoe body is cast onto a sheet metal backing plate, the latter being perforated or formed with openings or perforations to permit the metal of the body when poured to flush there through thereby efficiently at taching the backing plate and shoe body together whereby, in case of breakage of the shoe body the portions thereof will remain attached to the backing plate. I also propose to transversely bend the backing plate to shape up from the body part thereof the key lug and in order to attain additional strength at the point where the key lugs are formed I utilize the lips which are formed by slitting the side walls of the key lugs to produce the key way or slot, said lips being bent down so as to lap upon each other and being perforated for the metal of the shoe body to flush there through when poured into the mold, thereby locking and securely attaching said lips together and to the shoe body.

In the accompanying drawing wherein I have shown various embodiments of my invention, Figure 1 is a perspective view showing a sheet metal backing plate bent into shape to form two transverse folds for key lugs. Fig. 2 is a broken view in bottom plan of the same. Fig. 3 is a longitudinal section of the backing plate showing in diagram a shoe body to which the plate is applied. Fig. 4 is an end view of the plate. Fig. 5 is a view insection taken longitudinally of the plate on the line 5, 5, Fig. 4, and showing a single key lug. Fig. 6 is a view similar to Fig. 4 showing a slightly modified form of key lug. Fig. 7 is a broken view in section on the line 7, 7, Fig. 6. Fig. 8 is a view similar to Fig. 7 showing a slightly modified shape of key lug. Fig. 9 is a broken view in side elevation showing another modified shape of key lug.

In the drawing 10 designates a shoe body, which, in accordance with common practice is designed to be cast in a mold, and 11 is a sheet metal reinforcing plate or backing to be applied to the shoe body. The plate 11, after being perforated or provided with suitable openings there through, as indicated at 12, and after being transversely folded or bent to form one or more key lugs 13,14,

therein, and bent to the required shape to conform to the shoe body, is placed inthe mold into which the metalto form the shoe body is poured, whereby such metal, when poured not only forms the shoe body but also flushes through the openings or perforations 12 of the backing or reinforcing plate, asindicated at 15, thereby efficiently attaching the plate and shoe body together.

While I have shown longitudinally eX- tending openings 12, in the reinforcing plate, it is to be understood that my inven} tion is not to be limited in this respect.

As shown in the drawings the folds or bends in the reinforcing plate to form the key lug or lugs extend entirely across the plate, two such folds or bends 13, 14 being shown in Figs. 1, 2 and 3. To form the key way 21 through these lugs, the side walls of each lug are slitted to form tongues, 16, 17 and these tongues are bent down to lap. the one upon the other as clearly shown in Fig.3, and in order to secure these tongues together and to the metal of the shoe body, said tongues are provided with perforations 18, which register with each other when said tongues are bent down 1nto lapped relation, and

through these perforations the metal of the shoe body flushes, as indicated at 19. The

metal of the shoe body whichfiushes through the perforations 12, 18, of the reinforcing back plate and its tongues 16, 17 as above described, spreads over the outer face or surface of the plate and tongues, as indicated by the dotted lines in Fig. 3 thereby securely anchoring the plate to and embedding the same in the metal of the shoe body.

.The tongues 16, 17, form, in effect continuations of the plate through the bends or folds connecting web may be securely anchored to e or embedded in the metal of the shoe body by means of perforations 22, therein through which the metal of the shoe body flushes when poured.

It is not essential, in the broad scope of my invention that there should be two key lugs, as it may be found that one is sufficient, as indicated at 23, in Figs. 4c and 5. In this case the tongues 24, 25 are cut out of the side walls of the key lug to form the key slot 26, and are perforated as at 27 and bent down and lapped upon each other in identically the same manner as above described to form strengthening connections at the key lug for the portions of the backing plate which lie on opposite sides of the key lug.

It will be observed that the key slot 21, Figs. 1 and 3, and 26 Figs. 4 and 5, do not extend to the entire height of the key lugs. This, however is not an essential feature and in Figs. 6 and 7, I have shown a key lug 28, in which the key slot 29, is extended to the top of the key lug. In this case the tongues 30, are perforated, as at 31, and are intended to be bent down so as to top upon each other and to be secured together and to the shoe body in identically the same manner as above described. The advantage of this arrangement is that the key lug may be of less height than in the case shown in Fig. at, as a comparison of Figs. 4 and 6, will clearly show, Without affecting the dimensional height of the key slot. This results in a stiffer and consequently stronger channel shaped lug.

In Figs. 1, 3 and 5, the key lugs are shown as formed into rectangular outline. This, however, is not an essential shape, as the key lug may be rounded or of substantially U- shape as shown at 32, Fig. 9, or it may be somewhat tapered as shown at 33, Fig. 8.

From the foregoing description it will be seen that I provide a brake shoe structure which is strong, durable and economical to manufacture, and wherein I embody the advantages of prior structures while at the same time avoiding the objectionable fea tures thereof and wherein the key lug is formed by transversely binding the reinforcing back into channel shape with integral tongues to form connections between the end portions of the plate lying on opposite sides of the key lug, and this I regard as a most important feature of my invention.

Having now set forth the objects and nature of my invention and various forms of embodiment thereof, what I claim as new and useful, and of my own invention, and desire to secure by Letters Patent is,

1. A brake shoe consisting of a reinforcing back transversely bent or folded to form a fastening device integral therewith the side walls of the fastening device being cut out to form a key way, the cut out portions forming tongues which are lapped upon each other, in combination with a cast metal shoe body to which said reinforcing back and lapping tongues are secured.

2. A brake shoe consisting of a shoe body of cast metal, and a reinforcing sheet metal back thereof, said reinforcing back having transverse bends or folds therein to form one or more channel shaped key lugs, the side walls of said lugs being cut out to fo m tongues, said tongues being perforated and bent down to lap the one upon the other and receiving through said perforations the metal of the cast shoe body.

3. A brake shoe consisting of a shoe body of cast metal and a reinforcing sheet metal back, said back being transversely channeled to form a key lug integral therewith the walls of the key lug channel being slitted to form tongues, said tongues bent down and lapped the one upon the other to form a strengthening connection for the portions of the back lying on opposite sides of said lug, and means to secure said back and tongues to the cast metal body and said tongues to each other.

4. A brake shoe consisting of a cast metal shoe body and a sheet metal reinforcing back secured thereto said back being channeled its entire transverse width to form a key lug integral therewith, and having strengthening tongues connecting the portions thereof lying on opposite sides of the transverse channel, said tongues lapping upon each other and secured together and to the shoe body.

5. A brake shoe consisting of a cast metal body and a sheet metal reinforcing back secured thereto, said back being formed with a plurality of transverse channels to form integral securing devices, said channels being connected by an intermediate web, said web being secured to the shoe body.

In testimony whereof I have hereunto set my hand in the presence of the subscribing witnesses, on this 28th day of May A. D,

FREDERICK W. GRANT. Witnesses:

A. IVHITE, S. E. DARBY.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

